Lab Values Flashcards
CCT/ICU Lab Values
What are the Normal ABG Values?
pH: 7.35-7.45
CO2: 35-45
HCO3: 22-26
PaO2: 65-100
SPO2: 94-100%
BE: 2 +/- 2
Critical ABGs Value?
What does this mean?
pH < 7.2
pCO2 > 55
pO2 < 60
Critical ABG’s that require Intubation
Sodium (Na+)
Normal Range: 135 - 145 mEq/L
Hyponatremia
Sodium (Na+) < 135 mEq/L
Signs and symptoms: behavioral problems, muscle twitching, and cardiac abnormalities
Treatment: Corrected slowly to avoid neurological problems- with isotonic fluid NS/LR
Potassium (K+)
Normal Range: 3.5 – 5.0 mEq/L
MOST DANGEROUS ABNORMALITY
Hyperkalemia
Potassium (K+) > 5.0 mEq/L
Signs and symptoms: abdominal cramps, nausea, hypotension, bradycardia, numbness (especially in the legs)
Treatment:
Push K+ into the cells: CaCl /Ca Gluconate, Insulin, D10/50, high dose Albuterol.
Remove K+: Lasix, Kayexalate
K+ will change about 0.6 mEq/L for every 0.1 change in pH
Hypokalemia
Potassium (K+)< 3.5 mEq/L
Signs and symptoms: malaise, weakness, history of poor dietary intake.ECG shows Depressed,Inverted, or Flattened T
Waves
Treatment:Oral potassium 60 mEq,
10 mEq IV potassium NEVER give as a bolus (could be fatal IV Potassium is used in lethal injections)
Chloride (Cl-)
96-106 mEq/L
Extracellular anion
Tends to shift with Na+
Carbon Dioxide (Total CO2)
22-26 mEq/L
Blood Urea Nitrogen (BUN)
8-23 mg/dL
Helps provide a picture of Renal (kidney) clearance
Creatinine (Cr)
0.7 to 1.4 mg/dL
Helps provide a picture of renal clearance
BUN/Creatinine Ratio
What does High/Low value mean?
The normal BUN/Creatinine ratio range is 5 – 20 mg/dL.
A High ratio indicates dehydration, Hyperthyroidism, and Kidney disease
A low ratio indicates-Sickle cell anemia, Rhabdomyolysis, Hypothyroidism, Kidney damage, and kidney failure
Glucose (Glu)
70-110 mg/dL
What Labs are in Chem 7 (BMP)
Magnesium
1.7 to 2.2 mg/dL
Hypermagnesemia
Mg > 2.3 mg/dl
Hypermagnesemia is an uncommon problem in the absence of magnesium admission.
Signs and symptoms: Nausea, flushing, headache, lethargy, drowsiness, and diminished deep tendon reflexes, muscle paralysis leading to flaccid quadriplegia, apnea, and respiratory failure, complete heart block
Treatments - Intravenous calcium and Dialysis
Hypomagnesemia
Mg > 1.7 mg/dl
Signs and symptoms: tetany, arrhythmias, or seizures
History-alcoholics, pregnant or up to 3 mth after birth
Treatment: Receive intravenous (IV) magnesium
Total Calcium (Ca++ TOT)
8.5 - 10.2 mg/dL
The most essential electrolyte in the body
Found in 3 states:
47% Free: dispersed in body fluids
43% bound: bound to proteins, mainly albumin
10% chelated: bound to molecules (citrate, lactate,phosphate, etc)
Ionized Calcium (iCa)
4.5 – 5.6 mg/dL
Determines total body calcium to free calcium
Hypocalcemia
Ca++ TOT < 8.5 mg/dl or iCa < 4.4
Blood transfusions,Sepsis, Low levels of Albumin
Signs and symptoms: Anxiety, confusion, delirium, Hyperactive Deep Tendon Reflexes
Prolonged QT interval on EKG, narrow QRS, possible U wave
Treatment IV 3g of Ca gluconate or IV 1g of CaCl2
Chvostek’s Sign- Cheek muscle spasms when the facial nerve (CN VII) tapped(just in front of the ear). “Chvostek’s = Cheek.”
Trousseau’s Sign-Forearm tetany when blood pressure cuff is inflated